Senior Java Software Engineer

Ovyo; Madrid; Híbrido; EUR 50.000 - 70.000; Jornada completa

Descripción de la vacante

A professional services company is seeking a Senior Backend Engineer to focus on upgrading a Java-based internal production system, migrating from Java 8 to 17 or 21. The role requires deep expertise in Java, strong AWS deployment experience, and proficiency in Spring Boot. Candidates should have proven capabilities in developing low-latency, high-availability systems and ideally experience with MongoDB. Excellent communication skills in English are a must. The position is based in Madrid, with a project duration of at least 12 months.

Formación

• Deep expertise in Java and related technologies (Java 8, 11, 17).
• Proven experience developing high-concurrency, low-latency systems.
• Strong AWS experience, including deployment and cloud resource utilization.

Responsabilidades

• Upgrade a large internal production system with Java version migration.
• Ensure high availability and performance of backend systems.

Conocimientos

Java expertise

AWS experience

Spring / Spring Boot proficiency

High-concurrency system development

Database integration (MongoDB)

Open-source API integration

English communication skills

Herramientas

Terraform

AWS CloudFormation

Descripción del empleo

Senior Backend (Java) Engineer

Location: Madrid, Stockholm, Hong Kong or Singapore

Start Date: ASAP

Duration

12 months minimum

About Ovyo

Ovyo is a professional services company specializing in the satellite, telecommunications, media, and broadcasting, transportation and many more sectors. Our management team is located in the UK and Portugal and we have technical teams based across Europe and India.

Job Summary

This role focuses on upgrading a large internal production system - specifically a Java-based backend deployed on AWS - involving migration and testing work from Java 8 to Java 17 or 21. The project centres around a content management system (C-Controls backend).

Requirements

• Deep expertise in Java and related technologies (Java 8, 11, 17)
• Proven experience developing high-concurrency, low-latency, and high-availability systems
• Strong AWS experience, including deployment and cloud resource utilization
• Proficiency in Spring / Spring Boot and microservices architecture
• Experience with database integration (particularly MongoDB) including schema design, indexing, and performance tuning
• Hands‑on experience in Java version upgrades (migration, compatibility resolution, regression testing)
• Proven performance tuning and live debugging capabilities
• Experience integrating open‑source and third‑party APIs / libraries
• Strong understanding of engineering methodologies, tools, and best practices
• Excellent English communication skills.

AWS Experience

• Proven experience designing, deploying, and managing scalable, resilient applications on AWS
• Practical knowledge of AWS best practices for security, scalability, and cost optimization
• Hands‑on experience with Infrastructure as Code (IaC) tools such as Terraform or AWS CloudFormation
• Experience troubleshooting and optimizing AWS workloads to meet performance and reliability standards.

Nice to have

• Experience leading MongoDB upgrade projects, ensuring compatibility, data integrity, and minimal downtime